2023-01-03：超过 5 名学生的课。编写一个 SQL 查询来报告 至少有 5 个学生 的所有班级，返回结果不限顺序。请问 sql 语句如何写？ +---------+ | class | +-----

DROP TABLE IF EXISTS `courses`CREATE TABLE `courses` (  `student` varchar(255) NOT NULL,  `class` varchar(255) NOT NULL,  UNIQUE KEY `student` (`student`,`class`)) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO `courses` VALUES ('A', 'Math');INSERT INTO `courses` VALUES ('B', 'English');INSERT INTO `courses` VALUES ('C', 'Math');INSERT INTO `courses` VALUES ('D', 'Biology');INSERT INTO `courses` VALUES ('E', 'Math');INSERT INTO `courses` VALUES ('F', 'Computer');INSERT INTO `courses` VALUES ('G', 'Math');INSERT INTO `courses` VALUES ('H', 'Math');INSERT INTO `courses` VALUES ('I', 'Math');

SELECT class FROM courses GROUP BY class HAVING COUNT(DISTINCT student) >= 5